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INVENTUJK: 72ww W. A. DAVIS, Executor.

SEWING MACHINE.

J.- A. DAVIS, Deod.

WITN E.SSESiZ chmas .GLQQAK (No Model.)

(No Model.) 3 Sheets-Sheet 2'. -J. A. DAVIS, Deod.

W. A. DAVIS, Executor. SEWING MACHINE.

No. 353,255. Patented Nov. 23, 1886.

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J. A. DAVIS, Deod. W. A DAVIS, Executor.

SEWING MACHINE. No 353,255. Patented Nov 23, 1886.

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UNITED STATES PATENT OFFICE.

J OB A.'DAVIS, OF BOSTON, MASSACHUSETTS; WVILLARD A. DAVIS (EXEOUTOR OF SAID JOB A. DAVIS, DECEASED) ASSIGNOR OF ONE-HALF TOLEE E.

MOORE, BOTH OF SAME PLACE.

SEWING-MACHINE.

EPECIPICATION forming part of Letters Patent No. 353,255, dated November-23, 1886.

Application filed December 22, 1885. Serial X0. 186,470. (No model.) i

To all whom it may concern.-

Be it known that 1, JOB A. DAVIS, of Boston, in the county of Sufiolk and State of Massachusetts, have invented a new and useful Improvement in Sewing-Machines, of which the following, taken in connection with the accompanying drawings, is a specification.

The object of this invention is to provide improved means for simultaneously actuating the shuttle, needle, and awl-bar of a waxthread sewing-machine and causing the needle to feed the goods forward.

The devices set forth form detail features of an organized machine, described and shown I 5 generallyin my application,Seria1 No. 186,467,

for patent on wax-thread sewing-machines,

filed simultaneously herewith, the same part in each case being designated by the same letter. In the drawings hereto appended, Figure 1 is a front elevation of my improved machine,

showing the relative arrangement of the several parts pertaining to the present invention. Fig. 2 is a detail elevation of the levers operated by the wrist-pin H. Fig. 3 is a side elevation, showing especially the mechanism for operating the shuttle and needle. Fig. 4 is a horizontal section on line .r 00 of Fig. 3. Fig. 5 is a rear elevation, the base and shaft in section on line y y of Fig. 4.. Figs. 6 and 7 are transverse sections of the needle-bar and guide, taken, respectively, on the linesw and 2, Fig. 1. Figs. 8 to 11 are diagrams illustrating the successive positions of the shuttle, aw], needle, and thread-carrier in the formation of the stitch. Fig. 12 is an enlarged detail showing the character of the stitch.

The shuttle c is oscillated in a circular recess in the frame A of the machine by a combination of devices, whichwill be first described.

Power is applied to ashaft on which the cylinder Eis mounted for rotation. A wristpin, H, in the end of said cylinder (see Fig. 2) carries with it in its rotation the bell-crank lever F D, the upright arm F being pivoted at a to an arm, R, of the rocker-shaft S, which by another arm, T, and link (I actuates the .awl-bar, as is described in my said application No. 186,467, filed simultaneously here with. The short arm D of the bell-crank lever is slotted at F to receive a bolt, E, connecting tosaid arm the lever G. This lever G is connected by a pivot, B, to a similar lever,

J, which is pivoted to the end of the arm K, fixed by a screw, 1, to the oscillating shaft L. This shaft has a hub, S, fixed upon it, with lateral arms M M, Figs. 3 and 5. These arms are connected to the collar It on the short shaft 9 by links 0' O and chains P Q, said chains being kept from slipping on the collar R by any suitable means, such as the pins or screws T, which may also hold the collar R in place on its shaft 9. Now, since the shaft 9 has a disk, h, Fig. 4, which carries 6 the shuttle c, it is obvious that an oscillating movement will be imparted thereto by the vibration of the arms M M and the action of the connected parts, as above set forth. For

a detailed description of the shuttle itself ref- 7c erence may be made to my application, Serial No. 186,i68, thereon, filed simultaneously herewith. The vertical reciprocation of the needle-bar z is also effected by the oscillation of the shaft L, as will now be described. The reduced shouldered end of said shaft has fixed upon it a plate, U, Fig. 1, to which is secured aiother plate, V, in which is cuta cam-groove,

C. When the plate U \V is vibrated by the motion of the shaft L, the camgroove 0 gives works) to the frame A on a stud or screw, Y,

Fig. 1, so that when this plate X swings to the left on its pivot, while the needle A is protruding upwardly through the work, the latter will be moved to the extent of the length of a single stitch. To effect this swinging movement at the exact moment required, I provide a friction-roll, D on the end of the vibrating arm M, Figs. 3 and 5, which raises and lowers a plate, J by means of the pro- 10o jections IE and F, formed on said plate. This plate is formed in one with the plate G Fig. 3, which is slotted at 1 and guided in its vertical movement by a screw, H through said slot. A spring, J Fig. 1, has a bearing at one end in the plate G and at the other on the head of the screw H", to hold said plate to its place.

A lever, N pivoted on a stud, Q Figs. 4 and 5, is connected with the upper end of the plate G2 by the screw L The opposite end of said lever has a protuberance, V Fig. 1, which bears against a curved cam-surface, W, in the edge of the swinging plate X. It will be seen that when the plate G is lowered by the contact of the roller D with the projection on F of plate J, the lever N will be vibrated on its pivot, bringing its protuberance V up against the camsurface W", and thus swinging the plate X to the left in Fig. 1. This causes the needle to carry the goods forward, before it retreats drawing the upper thread down with it. WVhen the plate X is released by the lowering of the protuberance V said plate is carried back with the needle into a Vertical position by a spring, K A stop, 0 secured to the frame A by a screw, J checks this return movement at the proper point. The spring K is fastened to the frame by ascrew, Y", Fig. 3, its upper end beingadjustably attached to the plate X by the screw P The pivot Q of lever N is made solid in the frame of the machine, Figs. at and 5. By loosening the set-screw O and thumb-nuts M and T the lever i. may be moved to the right, Fig. 8, and thus the plate X will be moved a less distance by the action of the protuberance V It is therefore evident that the extent of the feed-n1ovement due to the lateral motion of the needle may be increased or diminished as desired. The relative movements of the needle and the shuttle may also be adjusted by varying the extent of oscillation of shaft L.

For this purpose Iform lateral arms H and A on the levers G and J, Fig. 2, and pass a stud or bolt, I, on the one through an arc-shaped slot, 0, of the other. oted levers G-and J more or less out of direct line and fixing them in position by this slot-andbolt arrangement the play of the arm K on the shaft L may be varied as desired, and the needle raised or lowered and adjusted to proper position with relation to the awl and shuttle. The throw of the needle and shuttle may also be increased or diminished by moving the bolt E in the slot F of arm D, as will be apparent.

What I claim is-- 1. The combination, with the rotary cylinder E, having the wrist-pin H, of the bellcrank lever FD, mounted on said pin, the oscillating or rocking shafts S and L, connected with said lever, the needle and awl bars, and connections between said bars and said shafts, substantially as set forth. v

2. The rocker-shaft L, having arms M M, in combination with the shuttle-shaft 9, provided with a shuttle-carrier, h, and the flexible connections extending from said arms to said shaft, whereby the vibration of said arms effects the oscillation of the shuttle, substantially as set forth.

8. The rocker-shaft L and the obliquelyslotted vibrating plate U WV, fixed thereon, in combination with the needle-bar Z, provided with a projecting stud and friction-roll V, engaging in the slot of said plate, whereby as the shaft L oscillates the needle is given a vertical reciprocation, substantially as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 13th day of November, A. D. 1885.

JOB A. DAVIS.

WVitnesses:

MILAN F. STEvENs, WILLARD A. DAVIS.

By throwing the piv- 

